Question

2,7,8,9怎样加运算符号等于24

Answer 1

1:(2 × (7 + 9)) - 8

2:2 × (7 + 9) - 8

3:(2 × (9 + 7)) - 8

4:2 × (9 + 7) - 8

5:(7 + 9) × 2 - 8

6:((7 + 9) × 2) - 8

7:(9 + 7) × 2 - 8

8:((9 + 7) × 2) - 8